resilience

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The ability to recover quickly from illness, change, or misfortune; buoyancy.
• noun The property of a material that enables it to resume its original shape or position after being bent, stretched, or compressed; elasticity.

from The Century Dictionary.

• noun The act of resiling, leaping, or springing back; the act of rebounding.
• noun In machinery See the quotation.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of springing back, rebounding, or resiling.
• noun The power or inherent property of returning to the form from which a substance is bent, stretched, compressed, or twisted; elasticity[1]; springiness; -- of objects and substances.
• noun The power or ability to recover quickly from a setback, depression, illness, overwork or other adversity; buoyancy; elasticity[2]; -- of people.
• noun (Mech. & Engin.) The mechanical work required to strain an elastic body, as a deflected beam, stretched spring, etc., to the elastic limit; also, the work performed by the body in recovering from such strain.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The mental ability to recover quickly from depression, illness or misfortune.
• noun The physical property of material that can resume its shape after being stretched or deformed; elasticity.
• noun The positive ability of a system or company to adapt itself to the consequences of a catastrophic failure caused by power outage, a fire, a bomb or similar (particularly IT systems, archives).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit
• noun an occurrence of rebounding or springing back